Plain text is a format you can choose to send your emails in. They work well for non-marketing-related content and can also give your emails a more personal feel. Rich media is defined as a broad range of interactive digital media that exhibit dynamic motion, taking advantage of enhanced sensory features such as video, audio and animation.

Rich media emails: It has coding involved and you can include a various picture and video formats in HTML emails, they have a better visual appeal. Plain Text emails: it is just plain text sent to the recipient without any coding, template design, links, images, etc.